Telephone-ringer.



HENRY TIDEMAN, 0l MENOMINEE, MICHIGAN.

TELEPHONE-RINGER.

Specication of Letters Patent.

Patented Oct. 13, 1908.

Application filed July 6, 1907. Serial No. 882,430.

To all whom it may concern:

Be it known that I, HENRY TIDEMAN, a citizen of the United States of America, and a resident of Menominee, county of Menominee, and State of Michigan, have invented a new and useful Improvement in Telephone-Ringers, of which the following is a specification.

My invention pertains to improvements in the mechanical structure of telephone signaling devices and particularly to telephone ringers.

My invention has as its object the provision of improved type of telephone ringer with improved self-locking adjusting means for the armature and cores thereof and with improved core terminals whereby the likelihood of accidental cross of the conductors with the ringer frame is much reduced.

I provide the adjustment means b putting a magnetic screw threaded hea upon the cores of the ringer, the screw threads of the head being provided with auxiliary tension means whereby they grip tightly the external threads of the core. The reduction of liability to 'accidental crosses of the conductor with the frame is provided for by false heads or shields placed over the core heads at the endswhere the conductors are broughtout.

In the drawings Figure 1 shows front view of the ringer; Fig. 2 shows side view; Fig. 3 shows a central section in the same di rection of view as Fig. 1; Fi 4 shows perspective of the screw threade magnetic core head; and Fig. 5 Ashows the spring element whereby the core head of Fig. 4 is given an elastic tension.

In Fig. l, 10 is a permanent magnet 11 is a magnetic yoke to which is attached permanent magnet 10 and the cores and s ools 12 12. The yoke 11 is extended beyon the length necessary to mount the magnet and cores, and in its extensions is formed to rovide contact surfaces for the inner sur ace of the bell box, the ends being erforated whereby a screw may be passe through yoke 11 to mount the com lete device upon the inner surface of the bell box, the tapper l1)?, projecting through the wall of the bell The cores 14 are threaded externally at the end 14. The non-magnetic yoke 15 is perforated at its ends to pass over the core ends 14', and carries in itsmedian portion Aears and trunnions for the armature 16. Lock nuts or lock rings 14 engage the outer threads of the core ends 14.

The core ends 14 are drilled andv threaded internally to receive the magnetic core heads 17. Detail of the core head 17 is shown in perspective in Fig. 4; it is a hexa onally headed screw drilled axially at 17 and slotted at 17. As this is desirably of the softest quality of iron, it has little or no elasticity, and I provide for the elasticity of the two split halves of the screw by insertin in the opening at 17 the cylinder 18 whic is split at 18 through a portion of its length. The s lit plug 18 is essentially of spring metal ut may be magnetic or non-magnetic, brass answering the purpose. The split lug 18 is driven into the split screw 17, s rea ing the halves of the screw 17; screw 1 is then compressed and screwed into the core end 14', the friction of screw threads being great on account of the spring tension of the split cylinder 18.

At 19 is shown the spool head of the spool 12, and at 20 is shown the false head or insulatin washer in a drive fit over the core 14. T e conductors 21 are twisted together and clipped short and by reason of being held away from the yoke 11 and other structural parts by the guard heads 20, a cross with the frame is almost impossible. The conductors 22 are also brou ht out between the heads 19 and 20, and t e likelihood of cross with adjacent portions of the frame is reduced by the presence of the guard head 20.

,The assembly of the device in manufacture is as follows: Upon the yoke 11 are mounted the spools 12; the connection of the conductors at 21 then is made; the yoke 15 is laced over the free ends of the cores 14; the

ook washers or lock nuts 14 are screwed down firmly to clamp the yoke 15 a ainst the core heads 23, thus locking the yo e 15 firmly. The magnetic core heads 17 then are laced in position and screwed down close y. The armature 16 is placed in the trunnions and the trunnions are adjusted. The plermanent magnet 10 then is mounted and t e device is complete, ready for adjustment. The adjustment is made by unscrewing the core heads 17 until by their approach to the armature the proper distances are attained when the adjustment is complete', as the friction of the threads of the part 17 is sufficient locking means The non-magnetic contact points 24 provide against sticking of the armature to the magnetic core heads. After the ringer and gon s have been mounted upon the bell box, ad]ustment of the tapper 13 to the gongs is sometimes required. This may be made by bending the rod of the tapper 13, by moving the gongs respectively, or, in the device of my invention herein shown, may be made by relative adjustment of the core heads 17.

Having thus described my invention,what I claim as new and desire to secure by United States Letters Patent is: A

l. In a telephone ringer,a core drilled and threaded internally at its armature end, a

core head for said core having a shank screwthreaded to en age the internal threads of said core, the s ank of said core head bein axially drilled and longitudinally slotte and means located within said shank for se arating said shank whereby an increased frlction of the screw threads of said `shank with the internal screw threads of said core may be attained, substantially as described. 2. In a telephone ringer, a core drilled and threaded internally at its armature end, a core head for said core having a shank screw threaded to engage the internal threads of said core, the shank of said core head bein axially drilled and lon itudinally slotte and a cylindrical plug o spring metal split through a portion of-its length and placed within the recess in said shank, whereby said shank may be spread underelastic tension to engage frictionally the threaded Walls o f said core end, substantially as described.v

Signed b'y Ine at Menominee, county of Menominee and State of Michigan, inthe presence-of two Witnesses.

HENRY TIDEMAN.

Witnesses:

LEOPOLD JAOKMAN, F. J. DONOVAN. 

